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United States of America Patent
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May 10, 2005
Grant Date -
Mar 7, 2002
app pub date -
Aug 15, 2001
filing date -
Feb 11, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and device for measuring the current in a conductor are presented. They utilize the Faraday effect on counter-propagating circularly polarized beams of light in a fiber optic coil. The light beams are transformed to and from circular polarization by a polarization transformer comprised of a birefringent fiber with a twist through an appropriate angle at an appropriate distance from one end.
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